VLLO is the lower validity limit for a measured value. Validity limits are one way to protect an application against bad measurements. This gross error detection relies on a combination of change values and absolute limits to determine when a measurement should be rejected. If the VLLO limit is crossed, the measured value is placed at VLLO or the maximum move allowed by VDVL when VLACTION=1. If VLACTION=0, there is no change in the measured value when a limit (VDVL, VLHI, VLLO) is exceeded.